I'm in the UK and have heard of several 'Mabel's, although fewer than some of the other 'old fashioned' names.
Children of people I know include Ada, Maisie, Anna, Arthur, Harry, Charlotte, Edward and Emily, and more than one Daisy
My elder sister was named after our grandmother, but it turned out that her name (and her 2 middle names) were 3 of the top 10 girl's names for the year she was born. Which is partly why I ended up with a name which is very unusual for someone my age - I have *never* met anyone who shares it who is not either 50 years older than me, or about 30 years younger. (My mother tells a story of being in a supermarket when I was quite small. I was picking things off the shelves after being told not to, so got a very stern, "[MyName] put that back AT ONCE" from my mother. At which point an elderly lady further up the aisle looked very guilty, and promptly fished several items out from under her coat and put them back on the shelves - whether she then gave up on shoplifting, of course, we don't know.
I went through a period of not liking my name because it was unusual (I was bullied, and it was one of the many things that was used by the bullies) but I've grown to like it.
(and the one time, when I was a child, that we found something in a shop with my name on it, my parents bought it for me with no argument, as it was so unusual. It was a rather nice hand made mug, and I had it for *years*
Some names just turn out to be popular. My younger sister's partner has the same name (and uses the same shorter form of it) as my brother, and my elder sister's brother in law has the same name, too, so we had three of them in wedding party at my sister's wedding.